JP2003068158A - Push button switch device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a push button switch device capable of reducing wiring in a contact circuit pattern and a stable switch operation by improving the combination of movable contacts with fixed contacts. SOLUTION: A fixed contact part 3 comprises a center part conductive pattern 1 and an annular intermittent conductive pattern 2 having divided fixed contacts 2a, 2b, 2c, and 2d disposed to surround the center part conductive pattern 1 while distributed along the circumference. The movable contact is formed in a reversed cup-shaped conductive energizing member 4. When a pressing force acts on a switch operating part 9 and the switch operating part 9 is pressed to a fixed contact part 3 side, the outer peripheral part of the conductive energizing member 4 comes into contact selectively with the divided fixed contacts 2a, 2b, 2c, and 2d, and the center part 8 of the conducive energizing member 4 comes into contact with the center part conductive pattern 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication device such as a mobile phone and a car phone, a measuring device, a remote controller, a handy terminal, a switch device for inputting data such as a keyboard, and other home electric appliances and electronic devices. The present invention relates to a push button switch device used for various switch devices in the fields of communication and the like.

[0002]

2. Description of the Related Art Conventionally, in a switch device of this type, when a switch is electrically opened and closed by a combination of a fixed contact provided on a fixed substrate side and a movable contact provided opposite to the fixed contact, it is generally used. A contact circuit is formed on the fixed substrate by forming a conductive circuit pattern and a wiring connecting the conductive circuit pattern with a copper foil or the like on a fixed substrate made of glass epoxy, which is made up of a plurality of layers or one layer.

As the contact circuit pattern, a comb-tooth pattern 30 composed of alternating plus lines 30a and minus lines 30b as shown in FIG. 5 and a plus line 31a as shown in FIG. The double annular pattern 31 including the minus line 31b was used.

Then, at positions facing the contact circuit patterns 30 and 31 formed on the fixed substrate 32, a conductive elastomer, a metal flat plate, a metal disc spring, or a conductive printed plastic sheet is processed. A movable contact (not shown) having conductivity such as a material is arranged, and when the switch is operated, the movable contact is pressed toward the fixed substrate 32 side, and finally, the contact circuit pattern 30 on the fixed substrate 32,
It is configured to contact 31. As a result, the positive wire 30 of the fixed contact of the contact circuit pattern 30, 31 is fixed.
The movable contacts connect a and 31a with the negative wires 30b and 31b so that electrical connection can be established.

On the other hand, at the end of the switch operation, the pressing force applied to the switch operation portion 21 is removed, the movable contact moves in the direction away from the fixed substrate 32, and returns to the original position. 31a and minus line 30
The state where the movable contacts are connected to b and 31b is released and the electrical connection is released.

[0006]

In the conventional switch device, the circuit configuration as described above is adopted, and the number of contact circuit patterns is equal to or more than the number of switch input operation keys, and these contact points are provided. It was necessary to provide wiring for connecting the circuit patterns.

For example, a mobile phone requires at least a numeric keypad for inputting a telephone number from 0 to 9 and a total of 12 switch parts including * and #. In this case, even if the negative lines of the respective switch parts are made common and the respective switch parts are connected, 13 wires are required in addition to the 12 positive lines.

Of course, as the number of switch parts increases, the number of wirings provided on the fixed substrate 32 also increases, and the wiring for connecting the electronic components mounted on the fixed substrate 32 and the formation of a circuit become complicated. , The contact circuit pattern (fixed contact) 30, 31 is provided with a sufficient area for the fixed substrate 32.
There was a problem that it could not be prepared above.

Therefore, various measures have been conventionally made in order to simplify this wiring. As a typical method thereof, as shown in FIG. 7, the contact circuit pattern on the plus line side provided in the central portion is divided into two parts, a B line 33a and a C line 33b, and the plus line side dividing line B Line 33a and C line 33
By connecting b with an annular minus pattern A line 33c provided around the plus line, there is a circuit in which a plurality of combinations of circuits having the same size as the conventional one can be realized. As a result, the number of wirings can be greatly reduced.

However, this method requires simultaneous connection of two types of contact circuit patterns on the plus line side in addition to the minus line, and the movable contact that can realize this has been limited to the metal disc spring.

FIG. 8 is a cross-sectional view of essential parts in the case where a contact circuit pattern (fixed contact) shown in FIG. 7 in which the plus line side is divided into two parts is combined with a metal disc spring which is a movable contact.

As shown in FIG. 8, when the inverted bowl-shaped metal disc spring 20 is used as the movable contact, the metal disc spring 20 has a high hardness although there is a click feeling during operation. Due to the above problem, when the pressure force transmitter 22 of the switch operation unit 21 is pressed and pushed down, only the contacting portion of the pressure force transmitter 22 is deformed and the fixed contact 23 is substantially in point contact. When the central portion of the fixed contact 23 is divided into a plus line 33a and a minus line 33b as in the comb-teeth pattern of FIG. 7, the plus line 33a and the minus line 33b are divided into two. There is a problem that it is difficult to surely contact both of them and contact failure occurs.

Further, in the conventional disc spring 20 made of metal, the open end portion 34 makes point-to-line contact with the fixed contact 23, so that the contact state may not be stable and contact failure may occur. It was

Therefore, in order to solve the above problems, the present invention is a push button switch device using a conductive urging member as a movable contact in order to generate a click feeling during operation, and is fixed to the movable contact. An object of the present invention is to provide a push button switch device that can realize a more stable switch operation while reducing wiring of a contact circuit pattern by devising a combination with a contact.

[0015]

In order to achieve the above object, the invention according to claim 1 comprises a movable contact provided in a switch operating portion and a fixed contact portion arranged to face the movable contact. In the push-button switch device, the fixed contact portion includes a central conductive pattern and an annular intermittent conductive pattern that is arranged so as to surround the central conductive pattern and is divided into a plurality of circumferentially fixed fixed contacts. And the movable contact is a reverse bowl-shaped conductive biasing member,
When a pressing force is applied to the switch operating portion and the switch operating portion is pushed toward the fixed contact portion side, the outer peripheral portion of the conductive biasing member selectively contacts the split fixed contact and the conductive biasing member. The central portion of the member is in contact with the central conductive pattern.

According to a second aspect of the present invention, in addition to the structure of the first aspect, a cutout portion which does not come into contact with the split fixed contact of the intermittent conductive pattern is formed on the outer peripheral portion of the conductive biasing member. It is characterized by that.

According to a third aspect of the present invention, in addition to the configuration of the first aspect, at least one of the plurality of divided fixed contacts of the intermittent conductive pattern is provided on the outer peripheral portion of the conductive biasing member.
It is characterized in that a protrusion that contacts one of the two is formed.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS.

[First Embodiment of the Invention] FIG. 1 is a plan view of a fixed contact pattern formed on a fixed substrate of a push button switch device according to an embodiment of the present invention.
Shows an example (Embodiment 1) in which a part of the movable contact is cut out, and FIG. 1B shows an example (Embodiment 2) in which a protrusion is formed in a part of the movable contact. FIG. 2 is a sectional view of an essential part showing a usage state of the push button switch device according to the first embodiment of the present invention. FIG. 3 is a schematic diagram showing the relationship between the fixed contact and the conductive line according to the embodiment of the present invention.

As shown in FIGS. 1 (a) and 1 (b), the fixed substrate 32 has a central conductive pattern 1, and the central conductive pattern 1 is arranged so as to surround the central conductive pattern 1 and extends in the circumferential direction. The divided fixed contacts 2a, 2b, 2c,
The fixed contact portion 3 including the intermittent conductive pattern 2 including 2d is formed. Here, the split fixed contacts 2a, 2
The number of b, 2c, and 2d may be determined as necessary, but in reality, from the problem of manufacturing accuracy of the conductive urging member 4 as the movable contact which is a counterpart component, about 2 to 8 Is desirable.

The conductive biasing member 4 shown by the phantom lines in FIGS. 1A and 1B is generally a metal disc spring, and has an outer diameter substantially equal to the outer diameter of the intermittent conductive pattern 2. It has a diameter and is arranged to face the fixed contact portion 3.

When a part of the movable contact is cut out, as shown in FIG.
As shown in (a), the split fixed contacts 2a, 2b, 2c, are attached to a part of the collar portion 5 that abuts the outer peripheral portion of the conductive biasing member 4.
A notch 6 slightly larger than one size of 2d is formed, and when the switch operating part 9 is pushed into the fixed substrate 32 side, the conductive biasing member 4 causes the divided fixed contacts 2a, 2b, 2 to be formed.
It realizes a state in which at least one of c and 2d is not contacted. The notch 6 is not limited to one, and may be set to any number depending on the number of switches required.
The minimum number is one, and the maximum number is one less than the number of split fixed contacts (for example, if there are eight split fixed contacts, the maximum number of cutouts is seven). That is, the outer peripheral portion of the conductive urging member 4 has the divided fixed contacts 2a, 2b, 2 of the intermittent conductive pattern.
c and 2d can be selectively contacted.

The conductive biasing member 4, which is a movable contact, has a collar portion 5 which is slightly inclined from the outer peripheral end portion 15 toward the center, and a collar portion 5 which is continuous with the collar portion 5 and is located inside thereof. And a substantially hemispherical surface portion 16 having a tangential line of a more steep angle, the central portion 8 of the top surface thereof is bonded to a pressing force transmitter 10 protruding from the central portion of the switch operating portion 9,
It is arranged to face the fixed contact portion 3.

Generally, the conductive urging member 4 has a diameter of about 5 m, which has a cross-sectional shape in which the central portion of the upper end of the inverted bowl shape is connected by an arc.
Although a metal disc spring of m is used, in the first embodiment, it is necessary to provide the notch 6 for position detection on the outer peripheral end 15 of the conductive biasing member 4 without changing its characteristics as much as possible. Therefore, the flange portion 5 is formed on the outer periphery of the substantially hemispherical surface portion 16 and extends outward by about 1.5 mm at a downward angle of about 15 degrees from the horizontal plane. Therefore, the diameter of the conductive biasing member 4 including the collar portion 5 of the first embodiment is about 8 mm.
As a result, in a state where the switch operating portion 9 is not pressed, as shown in FIG. 3A, the outer peripheral end portion 15 of the conductive biasing member 4 is in contact with the intermittent annular conductive pattern 2.
A slight gap is formed between the intermittent annular conductive pattern 2 and the terminal end portion 17 of the substantially hemispherical surface portion 16 of the conductive biasing member 4.

Here, in addition to solving the problem that the stability of the conductive biasing member 4 such as the balance degree is impaired,
An error in manufacturing the intermittent annular conductive pattern 2 provided on the fixed substrate 32 which is paired with the conductive urging member 4 and realizes electrical connection, the conductive urging member 4 which is a movable contact for the fixed substrate 32. Mounting position error, conductive biasing member 4
In consideration of the error in the punching process of the arc length of the notch formed in the notch, the notch 6 formed in the collar 5 of the conductive biasing member 4
Is preferably 1 to 3 and arranged at equal intervals.

Correspondingly, the intermittent conductive pattern 2 which is a fixed contact has an arc shape when the diameter including the collar portion 5 of the conductive urging member 4 which is a movable contact is about 8 mm as described above. The number of contacts is preferably 4 or 5 at most.

A method of using the push button switch device according to the first embodiment of the present invention will be described below.

When the switch operating portion 9 is pushed down as shown by the imaginary line in FIG. 2, the collar portion 5 of the conductive urging member 4 moves to the fixed substrate 32 side as shown in FIG. 3 (a). It elastically deforms so as to incline and comes into close contact with the intermittent conductive pattern 2, and thereafter, the central portion 8 of the conductive biasing member 4 undergoes buckling deformation toward the fixed substrate 32, and finally the central conductive pattern 1 is formed. Upon contact, the state becomes as shown in FIG. As a result, when the cutout portion 6 of the conductive biasing member 4 contacts the intermittent conductive pattern 2, the conductive pattern 2 cannot be electrically connected to the intermittent conductive pattern 2 at a position corresponding to the cutout portion 6, so that a position detection signal is obtained and the conductive Conduction can also be achieved by contact between the central portion 8 of the sexual biasing member 4 and the central conductive pattern 1.

Then, when the hand is released from the pressed switch operating portion 9, the conductive biasing member 4 and the switch operating portion 9 are released.
The elastic restoring force of the switch returns the switch operating portion 9 to the original position, and can be used repeatedly.

[Second Embodiment of the Invention] FIG. 1B is a plan view of a movable contact according to a second embodiment in which a protrusion is formed on a part of the movable contact.

In the second embodiment, as shown in FIG. 1B, when the switch operating portion 9 is pushed into the fixed substrate 32 side, a part of the outer peripheral portion of the conductive biasing member 4 is A protrusion 7 that can contact at least one of the split fixed contacts 2a, 2b, 2c, 2d is provided.

The number of protrusions 7 may be set to an arbitrary number according to the number of switch position detections required.
A maximum of one less than the number of split fixed contacts is selected (for example, if there are eight split fixed contacts, the maximum number of protrusions 7 is 7).
Individual). That is, the outer peripheral portion of the conductive biasing member 4 can be selectively brought into contact with the split fixed contacts 2a, 2b, 2c, 2d of the intermittent conductive pattern.

Since the other structure and method of use are the same as those of the first embodiment, the same structures are designated by the same reference numerals and the description thereof will be omitted.

Next, a combination of the central conductive pattern 1 which is the fixed contact portion 3 and the intermittent conductive pattern 2 and the conductive biasing member 4 which is the movable contact according to the first and second embodiments of the present invention will be described. .

As shown in FIG. 4, the intermittent conductive pattern 2 is formed.
Is divided into four negative lines of E line 11, F line 12, G line 13, and H line 14, and one notch is formed in the collar portion 5 of the conductive biasing member 4 with the central conductive pattern 1 as a positive line. 6 is formed and is connected to three adjacent points of the four minus lines of E line 11, F line 12, G line 13, and H line 14, the central conductive pattern 1 + E line 11, F line 12,
G line 13, central conductive pattern 1 + F line 12, G line 1
3, H line 14, central conductive pattern 1 + G line 12, H line 14, E line 11, central conductive pattern 1 + H line 14, E
Line 10, F line 11, central conductive pattern 1 + E line 11,
Five types of switching such as F line 12, G line 13 and H line 14 are possible.

Considering a combination utilizing these five types of switching patterns, five intermittent conductive patterns 2
And the central part conductive pattern 1 is used to the maximum, the combination is (5 × 1) / 1 + (5 × 4) / 2 + (5 × 4 ×
3) / (3 × 2) + (5 × 4 × 3 × 2) / (4 × 3 ×
2) + (5 × 4 × 3 × 2 × 1) / (2 × 4 × 4 × 5) =
It is possible to determine the position of 31 patterns, that is, 2 ⁿ -1 (where n is the number of intermittent portions of the intermittent annular conductive pattern), and only 5 + 1 wirings connecting these 31 patterns to the arithmetic circuit are provided. Since it can be covered by the main wiring, the wiring formed on the fixed substrate 32 can be significantly reduced.

As shown in FIGS. 2 and 3, in the case of the first embodiment in which the notch 6 is formed in a part of the collar portion 5 of the conductive biasing member 4, as compared with the case where the notch 6 is not provided. Since the effective area for the deformation force is small, elastic deformation can be easily performed. Further, even in the case of the second embodiment in which the protrusion 7 is formed on a part of the flange 5, the effective cross-sectional area with respect to the deformation force can be easily elastically deformed because of the small size of the protrusion 7. Therefore, in the push button switch device according to Embodiments 1 and 2 of the present invention, the collar portion 5 of the conductive biasing member 4, the intermittent conductive pattern 2, and the central portion 8 and the central portion of the conductive biasing member 4 are provided. Since the conductive patterns 1 are connected in surface contact with each other, the problem of poor contact does not occur.

[0038]

EXAMPLES Example 1 Example 1 corresponds to the first embodiment of the present invention.

The conductive urging member 4 has a cross-sectional shape (diameter 5 mm, S
A metal disc spring (made of US301) was used. Then, the reverse bowl-shaped substantially hemispherical surface portion 16 of the metal disc spring 4 is provided with a downward angle of about 15 degrees with respect to the horizontal plane and 1.5 mm outward.
The extended collar part 5 was formed. As a result, the diameter of the conductive biasing member (disc spring made of metal) 4 including the collar portion 5 becomes 8 mm, and between the intermittent conductive pattern 2 and the end portion 17 of the substantially hemispherical surface portion 16 of the disc spring made of metal 4. A gap of about 0.05 mm was formed.

Next, the end portion 17 of the substantially hemispherical portion 16 of the metal disc spring 4 is formed so that the position can be detected by realizing the electrical connection with the intermittent conductive pattern 2 on the fixed substrate 32.
Was extended by 1.5 mm, and several parts were cut out within an arc length of 3 mm. At this time, the notched arc length is 5 mm in diameter
In case of the metal disc spring 4 of 3 mm or less per location,
It has been confirmed that the value is optimum in order to obtain a stable electrical connection with the fixed substrate 32 while maintaining the pressing feeling when the switch operating portion 9 is pressed.

In the first embodiment, the metal disc spring 4 having a diameter of 5 mm has an arc length of 3 mm between the 12 o'clock direction and the 6 o'clock direction.
With two notches 6 at the same length, and a metal disc spring having notches 6 at an arc length of 3 mm at one place at 3 o'clock in the timepiece, and a metal disc spring having no notches 6 3 types were manufactured by a metal press punching method.

Further, the metal disc spring 4 is attached to the switch operating portion 9
In order to fix the pressing force transmitter 10 provided at the back surface of the pressing force transmitter 10 at a desired position, 3 mg of the adhesive agent Super X (manufactured by Cemedine Co., Ltd.) was applied to the tip of the pressing force transmitter 10.

In order to assemble the metal disc spring 4 having the predetermined cutout portion 6 at the desired switch operation portion 9 position, as shown in FIG.
As shown in FIG. 5, the aluminum aligning jig 20 provided with the convex portion 19 into which the cutout portion 6 of the metal disc spring 4 engages with the concave portion 18 into which the metal disc spring 4 enters is vibrated and aligned.

The metal disc springs 4 aligned and assembled on the alignment jig 20 are vacuum-adsorbed on the alignment jig 20 side, and an adhesive is applied in advance to prepare the switch operation part. It is bonded and fixed to the pressing force transmitting element 10 by combining with the jig on the side where 9 is incorporated. It was left in the room for about 2 hours until the adhesive was completely cured, and then taken out from the jig.

The intermittent conductive pattern 2 which is a fixed contact has a diameter of the metal disc spring 4 which is a movable contact of 5 m as described above.
When m is set, the number of arc-shaped contacts is suitably four or five, so that the fixed substrate 32 is provided on the fixed substrate 32 as shown in FIGS.
With the shape of the divided fixed contacts 2a, 2b, 2c, 2d as shown in (b), four types of wiring patterns are provided with a width of 2.6 mm and a length of 2 m.
m was provided in an intermittent annular shape having a diameter of 5 mm, and the central conductive pattern 1 having a diameter of 2 mm was provided at the center of the intermittent conductive pattern 2.

Therefore, while the number of contacts is normally provided only for recognition of four points, the result of verification in the first embodiment shows that when the central conductive pattern 3 is fixed,
Four types of position detection when one place of the metal disc spring is cut out, one type as position detection corresponding to the metal disc spring without cutout, and one position detection when the metal disc spring is cut out at two places A total of 15 types of position detection of 10 types could be realized with 5 lines. The potential position detection signal was also recognized without error.

Example 2 Example 2 corresponds to the second embodiment of the present invention.

In the second embodiment, the diameter is 5 mm (SUS301
0.2 mm in height, width 1.5 mm, length 1 mm at 12 o'clock and 6 o'clock in the outer peripheral part of the metal disc spring 4).
A metal disc spring 4 having a protrusion 7 formed therein, a metal disc spring 4 having a protrusion 7 having a height of 0.2 mm, a width of 1.5 mm and a length of 1 mm formed at one location of the timepiece at 3 o'clock, and a protrusion Three types of ordinary metal disc springs without 7 were manufactured by a punching method using a metal press machine.

In order to fix the metal disc spring 4 to the pressing force transmitter 10 on the back surface of the switch operating portion 9 at a desired position,
3 mg of the adhesive agent Super X (manufactured by Cemedine Co., Ltd.) was applied to the tip of the pressing force transmitter 10.

Since the metal disc spring 4 incorporates the projection 7 of the metal disc spring 4 at a desired position, an aluminum alignment jig (which is cut and machined at a desired position of the metal disc spring 4). By vibrating (not shown), the metal disc spring 4 was incorporated into this alignment jig.

The metal disc springs 4 aligned and incorporated on the alignment jig are vacuum-adsorbed on the alignment jig side. Adhesive Super X (manufactured by Cemedine Co., Ltd.) was applied in an amount of 3 mg in advance to the tip portion of the pressing force transmitter 10 provided on the back surface of the switch operation unit 9 and the prepared switch operation unit 9 was incorporated. The disc spring 4 made of metal is bonded and fixed to the pressing force transmitter 10 by fitting it with the jig on the bent side. It was left in the room for about 2 hours until the adhesive was completely cured, and then taken out from the jig.

On the other hand, on the fixed substrate 32, divided fixed contacts 2a, 2b, 2c, as shown in FIGS.
The shape was 2d, the width was 2.6 mm, the length was 2 mm, and the diameter was 5 mm, and the shape was intermittently provided in an annular shape, and the central conductive pattern 1 having a diameter of 2 mm was provided at the center of the intermittent conductive pattern 2.

There are three types of metal disc springs 4 (a metal disc spring having one projecting portion 7, a metal disc spring having two projecting portions 7 and a normal metal disc spring having no projecting portion 7). Therefore, the number of wires accompanying this is set to 5 lines. Normally, the number of contacts is provided only for recognizing four points, but as a result of verification in the second embodiment, when the line of the central conductive pattern 3 is fixed, one protrusion of the metal disc spring 4 is provided. 4 types of position detection when 7 is provided, 1 type of position detection corresponding to a normal metal disc spring without protrusion 7 and positions when protrusion 7 is provided at 2 positions of metal disc spring 4 As a detection, a total of 15 types of position detections could be realized with 5 lines. The potential position detection signal was also recognized without error.

[Third Embodiment] A third embodiment corresponds to the first and second embodiments of the present invention and is manufactured to confirm the combination of the movable contact and the fixed contact.

1A and 1A on the fixed substrate 32.
In the shape of the split fixed contacts 2a, 2b, 2c, 2d as shown in (b), the annular intermittent conductive pattern 2 is intermittent with a maximum diameter of 6.4 mm and a width of 2 mm, and a fixed contact portion 3 has a diameter of 2 mm at the center. Partial conductive patterns 1 are provided, and each of the intermittent conductive patterns 2 has four types of conductive lines E, F,
A fixed substrate 32 connected to G and H was created. That is, five types of conductive lines can be used for the fixed substrate 32.

Here, the split fixed contacts 2a, 2b, 2c,
The conductive lines are not connected to all the contact parts provided with it of 2d. In the first embodiment, one of the five types of conductive lines is connected to all the contact points provided on the fixed substrate 32 and the central conductive pattern 1 so as to be commonly used, and the intermittent conductive pattern 2 is used. Combination, that is, the split fixed contacts 2a, 2b, 2
a, a, a, a combination, b, b, b, b combination, c, c
a combination of c, c, a combination of d, d, d, d,
2 kinds of conductive lines are connected to 4 patterns a,
a combination of b, a, c, a, d, b, d and a, b, c in which four types of patterns are connected by four types of conductive lines,
a, b, d combination, a, c, d combination,
A combination of b, c and d, and similarly, four kinds of selections a, b, c and d were made. As a result, 15 types of combinations were made.

As the member for the push button switch, the metal disc spring 4 is attached on the fixed substrate 32 by an adhesive material so that the push force transmitter 10 provided on the back surface of the switch operating portion 9 made of elastomer can be opened and closed electrically. A sheet-like click feeling generating member (manufactured by Fujikura Ltd.) arranged at a predetermined position on the treated white polyester film was attached and incorporated.

As a result of the verification, when the intermittent conductive pattern 2 provided on the fixed substrate 32 is simplified and provided at only one place with a width of 2 mm, the fixed conductive substrate 2 is provided at a position facing the intermittent conductive pattern 2. The resist layer of the metal disc spring 4
Although scratches remained due to sliding during the movement of No. 1, it was confirmed that 15 types of position detection were possible with 5 lines without causing damage to the pattern provided under the resist layer or occurrence of defective conduction. .

[0059]

As described above, according to the first aspect of the present invention, the fixed contact portion is provided with the central conductive pattern, and the fixed contact portion is arranged so as to surround the central conductive pattern and has a circumference. Direction is composed of an annular intermittent conductive pattern consisting of divided fixed contacts divided in a direction, and the movable contact is a reverse bowl-shaped conductive urging member, and the pressing force acts on the switch operation part to fix the fixed contact part side. When it is pushed into, the outer peripheral part of the conductive biasing member selectively contacts the split fixed contact,
Since the central portion of the conductive biasing member is brought into contact with the central conductive pattern, it is possible to obtain the push button switch device capable of reducing the wiring of the contact circuit pattern.

According to the second aspect of the present invention, since the notch portion which does not come into contact with the split fixed contact of the intermittent conductive pattern is formed on the outer peripheral portion of the conductive biasing member, the notch is formed when the switch operating portion is pushed. Since the effective cross-sectional area for the deformation force is small by the portion, elastic deformation easily occurs, and the intermittent conductive pattern that is the fixed contact and the conductive biasing member that is the movable contact can make contact with each other while ensuring a sufficient contact area. In addition to the effect described in claim 1, more stable switch operation is realized.

According to the third aspect of the present invention, since the protrusion for contacting at least one of the plurality of divided fixed contacts of the intermittent conductive pattern is formed on the outer peripheral portion of the conductive biasing member, the switch operating portion is pushed in. At this time, the projection with a small effective area against the deformation force is easily elastically deformed, and the intermittent conductive pattern that is the fixed contact and the conductive biasing member that is the movable contact can make contact with each other while ensuring a sufficient contact area. Therefore, in addition to the effect described in claim 1, more stable switch operation is realized.

[Brief description of drawings]

FIG. 1 is a plan view of a fixed contact pattern formed on a fixed substrate of a push button switch device according to an embodiment of the present invention, FIG. 1) and FIG. 1B shows an example (embodiment 2) in which a protrusion is formed on a part of the movable contact.

FIG. 2 is a main-portion cross-sectional view showing a usage state of the push button switch device according to the first embodiment.

FIG. 3 is a cross-sectional view of essential parts showing the relationship between a movable contact and a fixed contact of the push button switch device according to the first embodiment,
3A shows a state where the outer peripheral portion of the movable contact is in contact with the fixed contact portion, and FIG. 3B shows a state where the central portion of the movable contact is in contact with the fixed contact portion. There is.

FIG. 4 is a plan view showing a contact circuit pattern of the push button switch device according to the same embodiment.

FIG. 5 is a plan view showing a comb-teeth-shaped contact circuit pattern of a conventional push button switch device.

FIG. 6 is a plan view showing a double annular contact circuit pattern of a conventional push button switch device.

FIG. 7 is a plan view showing a contact circuit pattern in which the plus line side of a conventional push button switch device is divided into two.

8 is a cross-sectional view of a main part showing a usage state of a conventional push button switch device having the contact circuit pattern of FIG.

FIG. 9 is a perspective view of an alignment jig used for assembling a conductive biasing member (metal disc spring).

[Explanation of symbols]

1 Central conductive pattern 2 Intermittent conductive pattern 2a, 2b, 2c, 2d split fixed contacts 3 Fixed contact part 4 Conductive biasing member (metal disc spring) 5 Collar (outer periphery) 6 notches 7 Projection 8 central part 9 Switch operation part 10 Pressure transmitter

Claims (3)

[Claims] 1. A push button switch device comprising a movable contact provided on a switch operating portion and a fixed contact portion arranged facing the movable contact, wherein the fixed contact portion includes a central conductive pattern, An annular intermittent conductive pattern, which is arranged so as to surround the central conductive pattern and is divided into a plurality of circumferentially divided fixed contacts, and the movable contact is a reverse bowl-shaped conductive biasing member, When a pressing force is applied to the switch operating portion and the switch operating portion is pushed toward the fixed contact portion side, the outer peripheral portion of the conductive biasing member selectively contacts the split fixed contact and the conductive biasing member. A push button switch device, wherein a central portion of the member is in contact with the central conductive pattern. 2. The push button switch device according to claim 1, wherein a cutout portion that does not come into contact with the split fixed contact of the intermittent conductive pattern is formed on an outer peripheral portion of the conductive biasing member. 3. The push button switch according to claim 1, wherein a protrusion that contacts at least one of the split fixed contacts of the intermittent conductive pattern is formed on an outer peripheral portion of the conductive biasing member. apparatus.